All of my ducks have been brought in as babies. I have not introduced anything into my flock of chickens or ducks that were not babies. I have ducks that have their own duck run and house and have been doing great. They are around 5 months old. Today one of my hens was laying in her nesting box not acting right. Tonight I went out to lock them in and she was outside in the run, but standing off by herself. I walked up to her and picked her up, she didn't quack, her eyes were dry, no unusual discharge from anywhere, and her bottom was dry. I put her over by the water and she drank then went inside and layed down. Does anyone have any ideas what might be wrong? They have been such healthy happy little ducks since I got them. The only thing that has changed is I got rid of 5 younger ones this weekend, do you think the stress of catching the 5 could cause her to be ill? Any help would be much appreciated. Thanks you.